Door auto lock disable

Does anyone know how to disable the auto lock feature on a SLT Quad cab 05. I don't want the doors to lock unless I lock them. They currently lock when speed of the truck goes over 15 MPH. I tried the off on x4 then lock without success. I know there has to be a way but it is not listed in the owners manual that I can find.

I tried to disable the auto door lock and the seat belt ring and I've done each of them 3 or 4 times and every time i do it it goes right back to the way it was. I don't have the overhead console but i tried changing it the way the manual said.

i was wondering if anyone has changed theirs yet and if it stayed the way you changed it?